Learn on PengiElements of Language, 2nd CourseChapter 7: Sentence Structure: The Four Basic Sentence Structures

Lesson 2: Complex Sentences and Compound-Complex Sentences

In this Grade 5 grammar lesson from Elements of Language, 2nd Course, students learn to identify and construct complex sentences, which contain one independent clause and at least one subordinate clause, as well as compound-complex sentences, which combine two or more independent clauses with at least one subordinate clause. Students practice recognizing connecting words such as after, because, when, and who that link subordinate clauses to independent clauses. The lesson includes exercises where students distinguish between complex and compound-complex sentence structures in context.

Section 1

Complex Sentences

Definition

A complex sentence contains one independent clause and at least one subordinate clause.

Explanation

Think of a complex sentence as one main idea with some extra information attached. The main idea is an independent clause—it could be a complete sentence all by itself! The extra information is a subordinate clause; it can't stand alone as a sentence and usually starts with a connecting word like since, if, when, or that.

Examples

  • Maria planted the rose bush in the sun so that it would get enough light. [This complex sentence has one independent clause and one subordinate clause.]
  • After the assembly ended, we found out that the principal had shared good news. [This complex sentence has one independent clause and two subordinate clauses.]

Section 2

Compound-Complex Sentences

Definition

A compound-complex sentence contains two or more independent clauses and at least one subordinate clause.

Explanation

This sentence is a super-combo! It mixes a compound sentence (which has two or more main ideas) with a complex sentence. So, you'll find at least two independent clauses joined together, plus at least one subordinate clause tagging along. It’s a great way to connect multiple complete thoughts with extra details.

Examples

  • When the music starts, I love to dance, but my brother sits down. [This compound-complex sentence has two independent clauses and one subordinate clause.]
  • Are you convinced that this plan will succeed, or should we develop a backup?
  • After the batter is mixed, you must pour it in the pan before it gets warm, or the cake will not rise properly. [This compound-complex sentence has two independent clauses and two subordinate clauses.]

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Chapter 7: Sentence Structure: The Four Basic Sentence Structures

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    Lesson 1: Simple Sentences and Compound Sentences

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    Lesson 2: Complex Sentences and Compound-Complex Sentences

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Section 1

Complex Sentences

Definition

A complex sentence contains one independent clause and at least one subordinate clause.

Explanation

Think of a complex sentence as one main idea with some extra information attached. The main idea is an independent clause—it could be a complete sentence all by itself! The extra information is a subordinate clause; it can't stand alone as a sentence and usually starts with a connecting word like since, if, when, or that.

Examples

  • Maria planted the rose bush in the sun so that it would get enough light. [This complex sentence has one independent clause and one subordinate clause.]
  • After the assembly ended, we found out that the principal had shared good news. [This complex sentence has one independent clause and two subordinate clauses.]

Section 2

Compound-Complex Sentences

Definition

A compound-complex sentence contains two or more independent clauses and at least one subordinate clause.

Explanation

This sentence is a super-combo! It mixes a compound sentence (which has two or more main ideas) with a complex sentence. So, you'll find at least two independent clauses joined together, plus at least one subordinate clause tagging along. It’s a great way to connect multiple complete thoughts with extra details.

Examples

  • When the music starts, I love to dance, but my brother sits down. [This compound-complex sentence has two independent clauses and one subordinate clause.]
  • Are you convinced that this plan will succeed, or should we develop a backup?
  • After the batter is mixed, you must pour it in the pan before it gets warm, or the cake will not rise properly. [This compound-complex sentence has two independent clauses and two subordinate clauses.]

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Chapter 7: Sentence Structure: The Four Basic Sentence Structures

  1. Lesson 1

    Lesson 1: Simple Sentences and Compound Sentences

    LearnPractice
  2. Lesson 2Current

    Lesson 2: Complex Sentences and Compound-Complex Sentences

    LearnPractice